Abstract
YF3:Yb3+(20%)/Tm3+(2%) octahedral nanocrystals were synthesized by a microemulsion method with NH4HF2. Pumped with a 980-nm diode laser, the nanocrystals emitted weak blue and intense ultraviolet light. Especially, unusual 3P2 → 3H6 (∼265 nm) and 3P2 → 3F4 (∼309 nm) emissions, coming from a five-photon excitation process, were observed. The emissions from 1D2 and 1I6 were much stronger than those from 1G4 and 3H4. The upconversion mechanism was discussed in detail.
| Original language | English |
|---|---|
| Pages (from-to) | 158-161 |
| Number of pages | 4 |
| Journal | Journal of Fluorine Chemistry |
| Volume | 130 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2009 |
| Externally published | Yes |
Keywords
- Luminescence
- Nanocrystals
- Rare earth
- Upconversion
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